Slipstream is the favorite of Starscream's Seeker's beside thundercracker and Skywarp.

The truth is She is actually the leader of the seekers yet Starscream doesn't notice
due to the fact that he's to busy trying become number 1 he's forgot about his current status of number 1 and that is how she likes it.

Like Starscream she is cunning and sly.

just think of it as this.
she is to Starscream to what Starscream is to megatron